![]() XBB caused a large wave of infections in Singapore in 2022.A study of XBB.1.5 infection outcomes in New York City, the likely epicenter of XBB1.5’s emergence in the US, found that there was no evidence of increased disease severity compared to BQ.1.The XBB variant family has 8 additional mutations and spreads even faster than BQ.1.1. XBB.1.5 ( nicknamed “Kraken” after a mythical sea monster) was first detected in New York in December 2022 and has a mutation that virologists believe allow the virus to bind to the ACE2 receptor more tightly, making it more immune evasive and transmissible.XBB.2.3 (nicknamed “Acrux”) is now the fastest growing XBB variant in the Bay Area and carries the worrisome immune-evading S:T478K mutation from the Delta variant, which confers stronger viral binding to the ACE2 receptor.It has been increasing in proportion across the US since April. XBB.1.16 (nicknamed “Arcturus”) has a transmission advantage over XBB.1.5 and was first detected in India in March 2023.Boosters, paxlovid, remdesivir and molnupiravir treatment are still effective against severe disease from XBB.1.16 and the newer variants. ![]() This means a greater risk for reinfections.Bay Area variant data shows that the new XBB.1.16 and XBB.2.3.variants are increasing in proportion (~12-14% each), while the XBB.1.5 variant (~59%) is decreasing after dominating from January to April.As of May 31, 2023, the XBB.1.16 and XBB.2.3 variants are increasing in proportion.Thanks for visiting and reading!įind the latest variant proportions: Bay Area & CA (click on variants, region) | US | US wastewater | Global These East Bay Covid updates will be on summer break from June to September 2023, then will be updated as needed with practice-changing updates rather than monthly. Long COVID prevention, resources, studies.How to check if a testing site is legit.Where to get free tests in the East Bay.Is treatment or PrEP effective against Omicron?.How do we prepare for the next variant?. ![]() “However, with the shortening of the incubation period of new variants, the isolation period can be adjusted appropriately to reduce the pressure on the health system.Section Navigation: COVID-19 Updates and Guide “Some countries around the world require close contacts to be isolated for 14 days,” they wrote. The study’s authors pointed to their own research as a reason that different countries may want to rethink their isolation time recommendations. Until earlier this month, when the CDC dropped much of its precautionary COVID guidance, the federal health agency recommended that those exposed to COVID quarantine for at least five days, and the World Health Organization still recommends quarantining for 14 days. On the bright side, an overall decrease in incubation period means less time for infected individuals to unknowingly transmit the virus. But they did not draw any further conclusions about differences in incubation time in relation to the severity of COVID variants in comparison to each other. Studies have shown that shorter incubation periods “are associated with more serious disease,” as was the case with fellow coronaviruses SARS and MERS, according to the study’s authors.
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